def add( a, b):
 print "ADDING %d + %d" % ( a, b)
 return a + b
def subtract( a, b):
 print "SUBTRACTING %d - %d" % ( a, b)
 return a - b
def multiply( a, b):
 print "MULTIPLYING %d * %d" % ( a, b)
 return a * b
def divide( a, b):
 print "DIVIDING %d / %d" % ( a, b)
 return a / b
print "Let's do some math with just functions!"
age = add(30,5)
height = subtract (78, 4)
weight = multiply (90, 2)
iq = divide (100, 2)
print "Age: %d, Height: %d, Weight: %d, IQ: %d " % (age,height,weight,iq)
# A puzzle for the extra credit, type it in anyway.
print "Here is a puzzle."
what = add( age, subtract( height, multiply( weight, divide( iq, 2))))
print "That becomes: " , what, "Can you do it by hand?"